Table 1 Specifications of the ITAG and some comparison tools

Sensors

Pressure (depth), temperature, light, 3-axis accelerometer, 3-axis magnetometer

Pressure (depth), temperature, light

Pressure (depth), temperature, light, 3-axis accelerometer, 3-axis magnetometer, Speed

Pressure (depth), temperature, 3-axis accelerometer, 3-axis magnetometer, speed

Size

Length (mm)

108.4

115

175

Width (mm)

64

38

26

Height (mm)

28.7

Weight (g) in air

102.5

57

175

Includes floatation

Yes—syntactic foam

Yes

No

No

Attachment type

Variable base (suction cups, sewn on or defined by user)

Towed from tether and anchor

Defined by user

Defined by user

Timed release

Yes

Yes

Yes

Yes

Battery type

Li-ion

AA

2 AA

Re-useable design

Yes

No

No

Memory

32 MB

16 MB

1 GB

64 MB

Depth

Max

1000

1700

2000

1000

Resolution (m)

0.03

0.5

0.5

Accuracy

±1 %

±1 % of reading

Accuracy: ±1 % of reading

Sample rate (Hz)

200

32

ca. 0039

Temperature

Range

−5 to 40 °C

−40 to 60 °C

Range: −40 °C to +60 °C

Resolution

0.01 °C

0.05 °C

Resolution: 0.05 °C

Accuracy

0.5 °C

±0.1 °C

Accuracy: ±0.1 °C

ca. 0039

Sample rate

200

Light sensor

Range

Variable dynamic range (typically 0.8 Ω/Lux)

5 × 10⁻¹² to 5 × 10⁻² W cm⁻²

Range: 5 × 10⁻¹⁰ W cm⁻² to 5 × 10⁻² W cm⁻² (eight decades)

N/A

Max sample rate (Hz)

200

32

N/A

Wavelength range

400–700 nm

unk

470 nm

N/A

Accelerometer

Range

±2 g

N/A

±2 g (−20 m/s/s to 20 m/s/s)

Resolution

0.01 mg

N/A

0.05 m/s/s

Max sample rate (Hz)

200

N/A

32

32

Magnetometer

Max sample rate (Hz)

200

N/A

32

32